Railway signaling apparatus



' May 5, 1942 c. w. FAILOR RAILWAY SIGNALING APPARATUS Filed Aug. 16,1940 2 Sheets-Sheet 1 INV NTOR C/ZLZIZQI' Fallon L mm)! S m n F m m L mmNN H15 ATTORNEY May 5, 1942. c. w. FAILOR RAILWAY SIGNALING APPARATUS 1Filed Au 16, 1946 A 2 Sheets-Sheet 2 IN TOR; (1201"! 1366101 @w i m QM mw Wm M m 7 m m w m m Lit m W HIS A'II'TORNEY Patented May 5, 1942 generaUNITED STATES PATENT OFFKCE RAILWAY SIGNALING APPARATUS Charles W.Failor, Forest Hills, Pa., assignor to The Union Switch & SignalCompany, Swissvale, Pa., a corporation of Pennsylvania ApplicationAugust 16, 1940, Serial No. 352,936

9 Claims.

My invention relates to railway signaling apparatus and moreparticularly to apparatus of this character in which provision is madefor traflic movements in either direction over the same stretch oftrack.

My invention is particularly well adapted for, though in no mannerlimited to, coded train control in reverse-running territory, eitherwith or without wayside signals, of the type in which the train controlcode is approach controlled. That is to say, the track circuits whenunoccupied are normally energized with the usual coded track circuitcurrent but become automatically energized with train control code uponthe approach of a train.

One object of my invention is to enable the same coded track circuitcontrol equipment to be used for traffic moving in either direction.Another object of my invention is to use stand-- ard apparatus such asis used in single-direction running track circuits, for performing adual I'Luiction depending on traflic direction. A further object of myinvention is to provide a simple, effective, and safe arrangement ofapparatus and circuits for controlling the movement of traffic in eitherdirection through the section. Other objects, purposes and features ofmy invention will be apparent from the description which follows.

I accomplish the foregoing objects by making one relay perform thefunction of a track relay for one direction of traflic and causing thesame relay to function as an impulse receiving relay for approachcontrol purposes when the traffic is in the other direction. Likewise,that relay which performs the function of a code repeater for onedirection of traffic automatically becomes an impulse transmitting relayfor approach control when trafiic is set up in the opposite direction.

I shall describe one form of apparatus embodying my invention and shallthen point out the novel features thereof in claims.

In the accompanying drawings, Figs. la. and 12) when placed end to endwith Fig. Id at the left, show a stretch of single track railwayequipped with apparatus embodying my invention. The apparatus of Fig. 1bis essentially a duplicate of the apparatus of Fig. 1a and is shown inorder to make more clear the operations involved in the passage of atrain through the section.

Similar reference characters refer to similar parts in each of the twoviews.

Referring to the drawings, the section D-E is equipped with similarwayside apparatus at each end of the section for the purpose ofcontrolling traflic passing in either direction through the section.Phantom wayside signals for each direction are shown in dotted lines atthe locations D and E as a means of indicating that it is at theselocations that a change may occur in the train controlling current foran approach.

ing train and that wayside signals, if used, would normally be placed atthese locations. I shall first describe the individual apparatus atlocation D and shall then point out how this apparatus cooperates withthe apparatus at the other end. of the section during the passage of atrain.

Looking at location I), the relay DS is the direction selecting relaywhich functions to establish the direction of traffic through thesection in accordance with the position occupied by its polar contacts.The polar contact I occupies the normal or left-hand position, as shown,for eastbound train movements and the reverse or righthand position forWestbound train movements. The specific manner in which relay DS iscontrolled forms no part of my invention and is not shown, forsimplicity. This directional control can be exercised by any suitableand well-known The track connected relay at location D is designated bythe reference character TR with a suffix corresponding to the location,this same suffix being used in conjunction with most of the apparatus atlocation D. The suhix E designates, for the most part, the apparatus atlocation E. With relay DS in the normal or eastbound position as shown,relay TRD performs the functions of the usual code following track relayas will be explained hereinafter, and relay CRD is then an approachimpulse transmitting relay. Relay 2TB under that condition functions asan approach impulse receiving relay and relay ZCR functions as a coderepeating relay which repeats the operation of coder CTISU 0r CTl5(depending on traffic conditions) and supplies the track circuit codewhich operates track relay TRD'.

The track circuit code impulses for eastbound traiiic are supplied froma suitable track battery TB over an adjustable current limiting resistorR, the secondary winding of the track transformer ZTT, andfront contact5 of the code repeating relay ZCR. Under proper conditions, the tracktransformer secondary will be supplying alternating current which willbe coded over contact 5 of relay 20R and supplied to the track as traincontrol code for the eastbound train.

Relay TRD in following the track circuit code, periodically reverses theflow of current in the input winding 6 of the decoding transformer DTD,over its reversing contact I, thereby inducing current impulses ofcorresponding code in the two output windings 8 and 9. The circuit forenergizing the input winding 6 may be traced from one terminal B of asuitable source of unidirectional current, neutral contact ID of relayDS, polar contact I I in its normal position, wire I2, contact I ofrelay TRD in either its up or down position, and winding 6, to the otherterminal C of the source. The output from winding 9 is rectified over asecond contact I3 of relay TRD and is used for energizing the decodingrelay HD over the polar contact I4 of relay DS as long as one of therelays TRD or ITR is fol lowing code. The latter relay will be effectiveas a track relay for westbound traffic and will perform thecorresponding pole changing and rectifying functions over its contactsI5 and I6, respectively, as will become clear hereinafter. The decodingtransformer DTD has its input pole changed over contact I of relay TRDfor eastbound moves and over contact I5 of relay ITR for westboundmoves.

The relayCRD, as pointed out before, functions either as an approachimpulse transmitting relay or as a code repeater depending upon whetherthe trafiic is eastbound or westbound, 0

respectively. When conditions are established for eastbound traffic, asshown in the drawings, relay CRD performs its impulse transmittingfunction by virtue of energy impulses which it receives from the uppersecondary winding 3 of the decoding transformer DTD. The energizingcircuit for relay CRD may be traced from the upper terminal of winding8, wire II, front contact I8 of relay DSEM, wire I9, and winding ofrelay CRD, to the lower terminal F of winding 8. Relay CRD is of thepolarized direct current type, closing its front contact 2ll-a whencurrent of normal polarity is applied thereto and closing its backcontact 26-bwhen current of reverse relative polarity is effective.

The impulse delivered from winding 8 when contact I is closed in its upposition is of reverse polarity so that at such time the relay CRD iscaused to keep its back contact --b closed. When contact I closes in itsdown position, an impulse of normal polarity is delivered to relay CRDso that contact 2i!-a will close. Accordingly, it will be apparent thatfor easbound traffic, each time that relay TRD is deenergized, relay CRDwill transmit an approach impulse of current from battery TB over its:front contact 28-41 to the impulse receiving relay ZTR at location E.The primary winding of transformer TTD is maintained short-circuited atsuch time over back contact 2! of relay DSWM to reduce arcing at thecontacts of relay CR5).

Relay Z'I'P at location E is a slow release repeater of front contact 22of relay 2TB, or of front contact 23 of relay TRE depending upon thetrafilc direction. For eastbound traffic. relay 2TP is energized over acircuit which includes front contact 22, wire 24, normal contact 25--aof relay ZDS, front contact 25, and wire IE'I, to relay 2TP. Forwestbound traflic, the energizing circuit is the same except that itincludes front contact 23 of relay TRE, wire 2.8, and reverse contact25-b of relay ZDS. Relay ZIP is normally energized but becomesdeenergized when an eastbound train enters the section, and supplies cabsignal energy to the primary winding of track transformer ZTT over acircuit which may be traced from one terminal BX of a source ofalternating current, back contact 29 of relay 2T1, wire 36, frontcontact 3| of relay EDSEM, wire 32, winding of transformer 2TT, andwires 33 and 34, to the other terminal CX of the source. This energy iscoded in the track by virtue of the operation of contact 5 of coderepeating relay ZCR.

For the other trafiic direction, relay lTP at location D becomesdeenergized when a westbound train enters the section, and supplies cabsignal energ to the primary winding of track trans former TTD over acircuit which may be traced from one terminal BX of a source ofalternating current, back contact 35 of relay ITP, wire 35, frontcontact 2! of relay DSWM, wire 31, winding of transformer TTD, and wire38, to the other terminal CX of the source. As in the case of eastboundtraflic, this cab signal energy is coded in the output circuit of thetrack transformer by means of the operation of contact ZQ-a of the coderepeating relay CRD.

Having described the individual apparatus, I shall now describe themanner in which the apparatus functions when a train passes through thesection.

Normally, when the section D-E is unoccupied as shown in the drawingsand the relays DS and 2DS are set up for an eastbound trafiic move, withthe section next in advance of DE also unoccupied, the relay TRE will befollowing code and will thereby maintain decoding relay HE energized sothat code will be furnished to code repeating relay 20R over thefollowing circuit: contact 39 of code transmitter CTISB, wire 40, frontcontact II of relay HEI, wires 42 and 43, front contact 44 of relay2DSEM, and wire 45, to relay 20R. Relay 2CR will follow 180 code and inso doing Will repeat this code into the track section D--E by virtue ofthe periodic closing of its front contact 5 which causes impulses ofcurrent from battery TB to be supplied to the rails. The primary windingof transformer ZTT will be short-circuited at this time over frontcontact 29 of relay 2'1? and front contact 3! of relay ZDSEM.

Relay TRD will follow the code transmitted by relay 20R and will causeimpulses of the proper polarity to be induced in winding 8 of thedecoding transformer DTD to thereby operate polarized relay CRD in sucha manner that back contact 29-11 will be closed when relay TRD is up andfront contact 20--a will be closed when relay TRD is down, as explainedhereinbefore.

Relay HD will be up as a result of the code following action of relayTRD, so that; 180 code will be supplied to relay ICR over a circuitidentical with that traced for relay 2CR, as described above.Accordingly, 180 code will be supplied to the section to the left oflocation D.

Each time that relay CRD closes its front contact 2-a, an approach codeimpulse is transmitted from battery TB over the rails to relay 2TR whichis the approach impulse receiving relay under the eastbound trail-1ccondition which has been assumed. It will be noted that when relay CRDis up, relay ZCR will be down, so that relay 2TB, will receive theapproach impulse transmitted by relay CRD over back contact 5 of relay26R. Also, when relay 20R is up, relay CRD will be down, so that relayTRD will receive the track circuit code impulse transmitted by relay ZCRover back contact 20-!) of relay CRD.

Relay Z'IR in following the approach code will maintain relay 2TP pickedup because of the periodic closing of front contact 22 of relay 2TB.Accordingly, no train control code will be supplied to the rails ofsection D-E under the assumed condition of unoccupancy.

When an eastbound train enters the section to the left of section D-E,relay ITR will become deenergized so that relay ITP will release and inso doing will cause alternating current to be supplied to the primarywinding of transformer ITT. This alternating current will be transformedinto 180 train control code by virtue of the 180 code operation of relayICR, whereby the train carried receiving apparatus will provide asuitable cab signal indication showing that the advance section DE isunoccupied.

When the train enters section D-E, relay 'IRD will become deenergized,causing relay CRD to become deenergized also, whereupon relay 2TB. willcease its code following action and will also remain deenergized. RelayZTP will release and will cause the application of 180 train controlcode at the exit end of section DE, as previously explained for theapproach section. If the section immediately in advance of location E isoccupied at the time the train enters section D-E, relay HE will bereleased so that 75 code will be supplied to the train because relay 2GBwill be responding to '75 code supplied over contact 46 of codetransmitter CT'i5. Thus, the cab signal will indicate caution until suchtime as the advance section becomes unoccupied.

When the train fully clears section DE, all of the apparatus of thissection will be restored to the normal condition in which it is shownexcept that the deenergization of relay HE due to the release of relayTR-E will cause 75 code to be effective in the section so that relaysTRD, CRD, ZTR, and 2GB, will all be following 75 code instead of 180.

When the train vacates the section immediately in advance of location E,relay TEE will begin to follow code so that relay HE will pick up andwill thereby restore 180 code to section D-E. Under this condition, allof the apparatus will be restored to the condition in which it isillustrated in the drawings.

If it is desired to permit a westbound train to pass through thesection, direction selecting relays DS and ZDS will be operated so thatpolar contact I occupies the right-hand or reverse position which ZDSWMto pick up and relays DSEM and ZDSEM to release. Relay CED will nowbecome a code repeating relay which will repeat the operation of codetransmitter CTlBIJ at location D by virtue of its energizing circuitwhich includes: contact 39, wire 45), front contact 4! of relay I-ID,wires 62 and 41, front contact 48 of relay DSWM, and wire 19, to relayCRD. Relay CRD will transmit an impulse from battery TB each time thatits front contact Ell-a is closed, for operating relay ZTR which nowbecomes a track relay for westbound traffic. The primary winding oftransformer TTD is maintained short-circuited over front contacts 2! and35 of relays DSWM and ITP, respectively.

Relay 2TB, in operating, will cause impulses to be induced in winding 8of decoding transformer D'IE which will in turn cause code operation ofrelay 20R as previously explained. This relay now becomes the approachcode transmitwill cause relays DSWM and ting relay for westboundtraiilc. The operation,

as explained hereinbefore, is such that when re-' lay ZCR is up totransmit a code impulse, relay CRD is down so that relay TRD isconnected with the rails for receiving the impulse. Also when relay CRDis up for transmitting its respective impulse, relay 20R is down so thatrelay 2TB, may respond. Relay TRD becomes the approach code receivingrelay for westbound traffic.

When a westbound train enters section DE, relay ZTR will cease to followcode so that relay 20R will become deenergized. Relay TRD willaccordingly cease to follow code so that relay ITP will release due tothe opening of the energizing circuit for this relay at front contact 23of relay TRD. Relays HD and GED will not, however, become cleenergizedbecause of the continued operation of relay ITR which energizes thedecoding transformer DTD over its contact I5. The primary winding oftransformer TTD will be energized with alternating current over thefront contact 2! of relay DSWM and back contact 35 of relay I TP, andthe cab signal code transmitted by relay CRD will be 180 since relay HDis energized. A proceed signal will therefore be displayed on the train.If the section to the left of location D happens to be occupied at thetime, relay HD will be released so that '75 code will be effective inthe rails of section D-E to cause a caution cab signal indication to beeffective in this section.

When the westbound train vacates section DE but still occupies thesection to the left of location I), relay CRD will be repeating code andrelays TED, 2TH, and 2GB will all be operating at 75 code. Then, whenthe section to the left of location D is cleared, pick-up of relay HDwill cause relay CRD to repeat code whereupon relays TED, 2TB, and ZCRwill operate at 180 code so that all of the apparatus will be restoredto the condition in which it is shown except for the direction selectingrelays DS, DSEM, and DSWM which have been assumed set up for westboundtraffic.

The circuits as shown are for two-block signaling but it is obvious thatthese could readily be expanded into three-block signaling, if desired,without altering the novel features of the apparatus. Also, if waysidesignals are used, these can be approach lighted over a back contact ofrelay ITP or 2T1? so that the approach feature may be applied either tocab signals or wayside signals, or to both.

It will be obvious from the foregoing that I have provided a singletrack system over which trafiic may move in either direction, in whichapproach control is effective and in which a minimum number of codefollowing relays are employed, the functions of certain of these relaysbeing interchanged depending on trafiic direction. I have furtherprovided a system of the above character in which the operations areperformed in a simple, safe, and reliable manner.

Although I have herein shown and described only one form of railwaysignaling apparatus embodying my invention, it is understood thatvarious changes and modifications may be made therein within the scopeof the appended claims without departing from the spirit and scope of myinvention.

Having thus described my invention, what I claim is:

1. In combination with a section of railway track over which traffic maymove in either direction, traffic direction selecting means having anormal and a reverse position for establishing eastbound and westboundtraific conditions respectively in said section, an eastbound coderepeating relay adjacent the eastbound exit end of said sectioneffective when said selecting means occupies its normal position forsupplying current impulses of an eastbound track circuit code to therails of section, an eastbound code following track relay adjacent theeastbound entrance and of said section responsive to impulses of saidtrack circuit code which it re ceives from said section, an eastboundapproach impulse transmitting relay adjacent said eastbound ent ance endeiiective during off intervals impulses of said track circuit code forsuppl ing current impulses of an eastbound appro ch code to the rails ofsaid section, an eastbound approach impulse receiving relay at saideastbound exit end responsive to the 1111-- pulses of said approach codewhich it receives from said section, and circuit means eifective whensaid direction selecting means is reversed to establish westboundtraffic conditions in said section for causing said eastbound impulsetransmitting relay to function as the westbound code repeating relay bysupplying current impulses of a westbound. track circuit code at thewestbound exit end of said section to thereby cause said eastboundimpulse receiving relay to function as the westbound track relay byresponding to impulses of said Westbound. track circuit code, saidcircuit means being also efiective under said westbound trafficconditions for causing said eastbound code repreating relay to functionas the westbound approach code transmitting relay supplying currentimpulses of a westbound approach code to the rails of said section tothereby cause operation of said eastbound track relay as a westboundapproach code r-ceiving relay.

2. In combination with a section of railway track, a code repeatingrelay and an approach impulse receiving relay both adjacent one end ofsaid section, means including a front contact of said code repeatingrelay for supplying current impulses of a track circuit code to therails of said section, a track relay and an approach impulsetransmitting relay both adjacent the other end of said section, meansincluding a back contact of said code repeating relay for periodicallyconnecting said approach impulse receiving relay in energy receivingrelation with the rails of section, means including a front contact ofsaid approach impulse transmitting relay for supplying current impulsesof an approach code to the rails of said section to operate saidapproach impulse receiving relay, means including a back contact of saidapproach impulse transmitting relay for periodically connecting saidtrack relay with said rails to receive current impulses of said trackcircuit code, and means eifective each time said track relay is releasedfor supplying an impulse of current to said approach impulsetransmitting relay to cause code operation thereof.

3. In combination with a section of railway track; a code repeatingrelay, an approach impulse receiving relay, a slow acting repeater ofsaid approach impulse receiving relay, and a normally deenergized tracktransformer all adjacent one end of said section; a track relay and anapproach impulse transmitting relay both adjacent the other end of saidsection, means including a front contact of said approach impulsereceiving relay for energizing said slow acting repeater, meansincluding a back contact of said slow acting repeater effective when atrain enters said other end of the section for i 1 front contact thereofto said section, means including a back contact of said approach impulsetransmitting relay for periodically connecting said track relay acrossthe rails of said section to cause operation thereof on said trackcircuit code when the section is unoccupied, means including a frontcontact of said slow acting repeater for normally short-circuiting saidtransformer input winding to thereby decrease the effective impedance ofsaid output winding and aid the supply of track circuit code by saidcode repeating relay, means governed by said track relay when operatingon said track circuit code for causing code operation of said approachimpulse transmitting relay alternately with its own code operation,means including a front contact of said approach impulse transmittingrelay for supplying current impulses of an approach code to saidsection, and means including a back contact of said code repeating relayfor periodically connecting said approach impulse receiving relay withthe rails of said section for operation by said approach code.

4. In combination with two adjoining sections of railway track, a trackrelay and an approach impulse transmitting relay for the forwardsection, an approach impulse receiving relay for the rear section, meansincluding a back contact of said impulse transmitting relay forconnecting said track relay with the rails of said forward section,means for supplying current impulses of a track circuit code to saidforward section to thereby cause code operation of said track relay, adecoding transformer for said forward section, means eifective when saidtrack relay is operating on said track circuit code and trafficconditions are eastbound in said two sections for supplying impulses ofcurrent to said decoding transformer to thereby cause an impulse outputto be delivered therefrom, means effective under said eastbound titanicconditions for applying said impulse out put to said impulsetransmitting relay to cause operation thereof, means for supplyingimpulses of current to the rails of said rear section to thereby causecode operation of said impulse receiving relay, means governed by saidimpulse receiving relay when responding to code and effective underwestbound traffic conditions for supplying impulses of current to saiddecoding transformer, and means controlled by the impulse output fromsaid decoding transformer effective under said westbound trafficconditions for causing code operation of said impulse transmittingrelay.

5. In combination with two adjoining sections of railway track, a trackrelay and an approach impulse transmitting relay for the forward section, an approach impulse receiving relay for the rear section, meansincluding a back contact of said impulse transmitting relay forconnecting said track relay with the rails of said forward section,means for supplying current impulses of a track circuit code to saidforward section to thereby cause code operation of said track relay, adecoding transformer for said forward section, a traific directionselector for said two sections, means effective when said track relay isoperating on said track circuit code and said selector occupies itseastbound position for supplying impulses of current to said decodingtransformer to cause an impulse output to be delivered therefrom, meanseffective when said selector occupies its eastbound position forapplying said impulse output to said impulse transmitting relay to causecode operation thereof whereby an approach code is transmitted to saidforward section, means for supplying impulses of current to the rails ofsaid rear section to thereby cause code operation of said impulsereceiving relay,

means governed by said impulse receiving relay when responding to codeand effective when said selector occupies its westbound position forsupplying impulses of current to said decoding transformer, and meanscontrolled by the impulse output from said decoding transformereffective when said selector occupies its westbound position for causingcode operation of said impulse transmitting relay.

6. In combination with a section of railway track, a code repeatingrelay and an approach impulse receiving relay adjacent one end of saidsection, a track relay and an approach impulse transmitting relayadjacent the other end of said section, traific direction selectingmeans, means controlled by said direction selecting means for operatingsaid code repeating relay on code, means including a front contact ofsaid code repeating relay for supplying current impulses of a, trackcircuit code to the rails of said section, means including a backcontact of said code repeating relay for periodically connecting saidapproach impulse receiving relay to receive energy from the rails ofsaid section, means including a back contact of said approach impulsetransmitting relay for periodically connecting said track relay with therails for response to said track circuit code, a normally deenergizeddecoding relay responsive to code operation of said track relay, meanscontrolled by said decoding relay for selecting the code effective inthe section to the rear of said section, means, responsive to codeoperation of said track'relay for causing code operation of saidapproach impulse transmitting relay, and means including a front contactof said last-named relay for supplying current impulses of an approachcode to the rails of said section to thereby operate said approachimpulse receiving relay.

7. In combination with a section of railway track over which traific maymove in either direction, a first code transmitting relay and a firstcode receiving relay adjacent one end of said section, a second codetransmitting relay and a second code receiving relay adjacent the otherend of said section, trafiic direction selecting means having a normalposition for eastbound traiiic and a reverse position for Westboundtraific through said section, means effec tive when said selecting meansis in its normal position for causing said first transmitting relay toupply current impulses of a track circuit code to said section inaccordance with trailic conditions in advance thereof to cause codeoperation of said second receiving relay, means controlled by saidsecond receiving relay e fective when said selecting means is in itsnormal position for causing said second transmitting relay to supplycurrent impulses of an approach code to said section to cause codeoperation of said first receiving relay, and means effective when saidselecting means is in its reverse position for interchanging the codetransmitting function of said first transmitting relay with the codetransmitting function of said second transmitting relay and forinterchanging the code receiving function of said first receiving relaywith the code receiving function of said second receiving relay.

8. In combination with a section of railway track over which traffic maymove in either direction, a first code transmitting relay and a firstcode receiving relay adjacent one end of said section, a second codetransmitting relay and a second code receiving relay adjacent the otherend of said section, two trafiic direction selectors, means effectivewhen the first selector occupies its eastbound position for causing thefirst transmitting relay to supply current impulses of a track circuitcode to said section in accordance with trafiic conditions in advancethereof to cause code operation of said second receiving relay, meanscontrolled by said second receiving relay effective when the secondselector occupies its eastbound position for causing said secondtransmitting relay to supply current impulses of an approach code tosaid section to cause code operation of said first receiving relay, andmeans efiective when both said selectors occupy their westbound positionfor interchanging the code transmitting function of aid firsttransmitting relay with the code transmitting function of said secondtransmitting relay and for interchanging the code receiving function ofsaid first receiving relay with the code receiving function of saidsecond receiving relay.

9. In combination with a section of railway track over which traific maymove in either direction, a first code transmitting relay and a firstcode receiving relay adjacent one end of said section, a second codetransmitting and a second code receiving relay adjacent the other end ofsaid section, traffic direction selecting means having a normal positionfor eastbound trafiic and a reverse position for westbound trafficthrough said section, means effectiv when said selecting means is in itsnormal position for causing said first transmitting relay to supplycurrent impulses of a track circuit code to said section to cause codeoperation of said second receiving relay, means controlled by saidsecond receiving relay effective when said selecting means is in itsnormal position for causing code operation of said second transmittingrelay alternately with its own code operation to thereby cause saidsecond transmitting relay to supply current impulses of an approach codeto said section, means controlled by said first transmitting relay forcausing code operation of said first receiving relay on said approachcode, and means effective when said selecting means is in its reverseposition for interchanging the code transmitting function of said firsttransmitting relay with the code transmitting function of said secondtransmitting relay and for interchanging the code receiving function ofsaid first receiving relay with the code receiving function of saidsecand receiving relay.

CHARLES Wv FAILOR,

